{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-98600","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-25T10:25:14.359Z","datePublished":"2026-10-18T15:19:12.864Z","dateUpdated":"2026-10-19T09:22:26.711Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-19T09:22:26.711Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()\n\nWhile rfcomm_recv_frame() verifies that skb->len is at least\nsizeof(*hdr) + 1 (4 bytes: 3-byte header + 1-byte FCS), an RFCOMM frame\nwith an extended 2-byte length field (!__test_ea(hdr->len)) has a 4-byte\nheader plus a 1-byte FCS (5 bytes minimum, sizeof(*hdr) + 2).\n\nWhen a 4-byte RFCOMM frame with EA == 0 arrives:\n1. The initial skb->len < sizeof(*hdr) + 1 check passes (4 < 4 is false).\n2. Trimming the FCS byte decrements skb->len to 3.\n3. If __check_fcs() succeeds, skb_pull(skb, 4) fails (4 > 3) and returns\n   NULL without advancing skb->data.\n4. Because the return value of skb_pull() is ignored, the un-pulled\n   3-byte struct rfcomm_hdr remains at skb->data and is either queued as\n   application payload via rfcomm_recv_data() or parsed as a multiplexer\n   control command via rfcomm_recv_mcc() on DLCI 0.\n\nFix this by extending the length check in rfcomm_recv_frame() to also\nrequire skb->len >= sizeof(*hdr) + 2 when !__test_ea(hdr->len)."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/rfcomm/core.c"],"versions":[{"version":"fb40eda15122f6b780228639c1ead6820340ff54","lessThan":"76876fd26569302d26d91cbe8b75fa8e66cf8969","status":"affected","versionType":"git"},{"version":"3829af5fab5a22405bf1e7d69068c2ec0fce46ca","lessThan":"97711b964877242933484989224a3c4c5d88a5ee","status":"affected","versionType":"git"},{"version":"b161eacd7fa4a2d765724b5504ac6cc388e48f80","lessThan":"7a1781a2f3a9667b3065d402d1f11986a2363e08","status":"affected","versionType":"git"},{"version":"30d1d9f3495463f7c026e4c553127f79b486fcd6","lessThan":"c25587fa26761e623198b4f47151fe79d09ccde6","status":"affected","versionType":"git"},{"version":"67dc3b40fae71b6b11c71e7ff69bac0758818c05","lessThan":"71ccacde407b7d8f0ef48974a0d2524602fd5c44","status":"affected","versionType":"git"},{"version":"bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51","lessThan":"be00deee60044ffa820f9436415caeb665b2cda0","status":"affected","versionType":"git"},{"version":"b230e5bf501c5edaf2eb0991cb862ac142031d4b","lessThan":"9240fc1f2cde5331c61608da21b00394602ca762","status":"affected","versionType":"git"},{"version":"b230e5bf501c5edaf2eb0991cb862ac142031d4b","lessThan":"6d91041bb38b97e2feb625123cc0529d7b83a0e1","status":"affected","versionType":"git"},{"version":"6.12.111","lessThan":"6.12.112","status":"affected","versionType":"semver"},{"version":"6.18.53","lessThan":"6.18.55","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/bluetooth/rfcomm/core.c"],"versions":[{"version":"7.2","status":"affected"},{"version":"0","lessThan":"7.2","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.111","versionEndExcluding":"6.12.112"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.53","versionEndExcluding":"6.18.55"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.2","versionEndExcluding":"7.2.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.2","versionEndExcluding":"7.3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/76876fd26569302d26d91cbe8b75fa8e66cf8969"},{"url":"https://git.kernel.org/stable/c/97711b964877242933484989224a3c4c5d88a5ee"},{"url":"https://git.kernel.org/stable/c/7a1781a2f3a9667b3065d402d1f11986a2363e08"},{"url":"https://git.kernel.org/stable/c/c25587fa26761e623198b4f47151fe79d09ccde6"},{"url":"https://git.kernel.org/stable/c/71ccacde407b7d8f0ef48974a0d2524602fd5c44"},{"url":"https://git.kernel.org/stable/c/be00deee60044ffa820f9436415caeb665b2cda0"},{"url":"https://git.kernel.org/stable/c/9240fc1f2cde5331c61608da21b00394602ca762"},{"url":"https://git.kernel.org/stable/c/6d91041bb38b97e2feb625123cc0529d7b83a0e1"}],"title":"Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()","x_generator":{"engine":"bippy-1.2.0"}}}}